bugaboo vs vexation

bugaboo and vexation both are nouns.

Word	Noun	Adjective	Verb	Adverb
bugaboo	Yes	No	No	No
vexation	Yes	No	No	No

As nouns, vexation is a hypernym of bugaboo; that is, vexation is a word with a broader meaning than bugaboo:

Other hypernyms of bugaboo include concern, headache, worry.

bugaboo (noun)	vexation (noun)
a source of concern	the act of troubling or annoying someone
an imaginary monster used to frighten children	something or someone that causes anxiety; a source of unhappiness
	anger produced by some annoying irritation
	the psychological state of being irritated or annoyed